Much research has also been conducted on everolimus and other mTOR inhibitors as targeted therapy for use in a number of cancers. It is marketed by Novartis under the tradenames Zortress (USA) and Certican (Europe and other countries) in transplantation medicine, and Afinitor in oncology. Everolimus also available with Biocon with the brand name of Evertor.
Female fox and gray squirrels that are at least two years old have two litters per year, younger females have only one litter per year. Average litter size is two to four (southern flying squirrels may have litters of up to seven young), with young weaned around eight weeks of age.
Squirrels build nests of twigs and leaves, which can measure up to 30cm in diameter. However, they may also choose to nest in people's houses, which can cause potentially serious problems (more on this later). There are generally two breeding seasons, one in late winter/early spring and the other in the summer/autumn. Three or four kittens are born in each litter. They begin to forage with their mother after 4-5 weeks, and leave the nest after 10-12 weeks.